[K/N][Tests] Adjust moved codegen tests to new infra

^KT-61259

native/native.tests/testData/codegen/function/defaults1.kt

@@ -3,16 +3,15 @@
  * that can be found in the LICENSE file.
  */
 
-package codegen.function.defaults1
-
 import kotlin.test.*
 
 fun foo(x:Int = 0, y:Int = x + 1, z:Int = x + y + 1) = x + y + z
 
-@Test fun runTest() {
+fun box(): String {
   val v = foo()
   if (v != 3) {
     println("test failed $v expected 3")
     throw  Error()
   }
+  return "OK"
 }